SMAJ90C Equivalent & Substitute Parts

Part Overview

The SMAJ90C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., rated for 90V reverse standoff voltage with a 153.3V maximum clamping voltage at peak pulse current. This component is designed for general-purpose transient voltage suppression in surface mount applications using the DO-214AC (SMA) package. The SMAJ90C is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SMAJ90C
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Voltage - Reverse Standoff (Typ)	90V
Voltage - Breakdown (Min)	94.95V
Voltage - Clamping (Max) @ Ipp	153.3V
Current - Peak Pulse (10/1000µs)	2.7A
Power - Peak Pulse	400W
Package / Case	DO-214AC, SMA
Operating Temperature	-65°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the SMAJ90C are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 90V
Package / Case: DO-214AC, SMA
Type: Zener, Bidirectional
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: 146V to 160V (within transient suppression tolerance)
Current - Peak Pulse (10/1000µs): 2.7A to 3.4A (higher current capability acceptable)
Power - Peak Pulse: 400W to 500W (higher power rating acceptable)
Operating Temperature: -65°C to -50°C minimum; 150°C to 175°C maximum (extended ranges acceptable)

All substitute parts maintain the 90V reverse standoff voltage specification and DO-214AC package form factor, ensuring direct functional and mechanical compatibility.

Parameter Comparison

Parameter	SMAJ90C (Main)	SMAJ90CA (MDD)	SMAJ90CA-TP (Micro Commercial Co)	SMAJ90CAE3/TR13 (Microchip)	SMAJ90CE3/TR13 (Microchip)	TV04A900JB-G (Comchip)
Voltage - Reverse Standoff (Typ)	90V	90V	90V	90V	90V	90V
Voltage - Breakdown (Min)	94.95V	100V	100V	100V	100V	100V
Voltage - Clamping (Max) @ Ipp	153.3V	146V	146V	146V	160V	146V
Current - Peak Pulse (10/1000µs)	2.7A	2.7A	2.7A	3.4A	3.1A	2.74A
Power - Peak Pulse	400W	400W	400W	500W	500W	400W
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature	-65°C ~ 150°C (TJ)	-50°C ~ 150°C (TJ)	-55°C ~ 175°C (TA)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance, providing long-term availability and regulatory alignment compared to the obsolete SMAJ90C.

SMAJ90CA (MDD): Direct electrical equivalent with matching 2.7A peak pulse current and 400W power rating. Operates within -50°C to 150°C temperature range. Suitable for applications where the original SMAJ90C specifications are required with minimal design modification.

SMAJ90CA-TP (Micro Commercial Co): Identical electrical specifications to SMAJ90CA with extended upper operating temperature to 175°C. Supplied in Tape & Reel packaging. Recommended for high-temperature environments or automated assembly processes.

SMAJ90CAE3/TR13 (Microchip Technology): Enhanced current rating of 3.4A and 500W power dissipation capability. Maintains 146V clamping voltage. Provides additional transient suppression margin. Operates -65°C to 150°C. Suitable for applications requiring higher transient energy absorption.

SMAJ90CE3/TR13 (Microchip Technology): Highest clamping voltage at 160V with 3.1A peak pulse current and 500W power rating. Operates -65°C to 150°C. Recommended for applications with higher transient voltage peaks or where additional suppression margin is required.

TV04A900JB-G (Comchip Technology): Cross-manufacturer alternative with 2.74A peak pulse current and 146V clamping voltage. Operates -55°C to 150°C. Provides functional equivalence with alternative sourcing option.

Frequently Asked Questions (FAQ)

Q: Can SMAJ90CA be used as a direct replacement for SMAJ90C?

A: Yes. Both parts share the same 90V reverse standoff voltage, 146V clamping voltage (within acceptable tolerance of the original 153.3V), 2.7A peak pulse current, and DO-214AC package. SMAJ90CA is an active product, eliminating obsolescence risk.

Q: What is the difference between SMAJ90CAE3/TR13 and SMAJ90CE3/TR13?

A: SMAJ90CAE3/TR13 provides 3.4A peak pulse current with 146V clamping voltage and 500W power rating. SMAJ90CE3/TR13 provides 3.1A peak pulse current with 160V clamping voltage and 500W power rating. Selection depends on whether higher current handling or higher voltage clamping is prioritized for the application.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical and PCB layout compatibility with the original SMAJ90C design.

Q: What is the temperature range difference between substitute parts?

A: SMAJ90CA operates -50°C to 150°C. SMAJ90CA-TP extends to 175°C maximum. Microchip parts (SMAJ90CAE3/TR13 and SMAJ90CE3/TR13) operate -65°C to 150°C, matching the original SMAJ90C lower temperature limit. TV04A900JB-G operates -55°C to 150°C. Select based on application temperature requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: Can higher-rated parts (3.4A, 500W) be used in place of the original 2.7A, 400W specification?

A: Yes. Higher current and power ratings provide additional transient suppression capability without compromising circuit protection. The 90V reverse standoff voltage and clamping characteristics remain the primary functional parameters.

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